Lego using illegal techniques?

Lego has always had techniques that they never use, like the clip and tile, but in 2015 with the avengers helicarrier came with a few barricade that used a 1*4 tile and a 1*1 clip, fast forward to modern day and there is so far there was none usually uses them until 2019 with the pirate ship minecraft set and it came with a parrot that had a strange way they used the tail, a 1*1 tile with a 1*1 side clip for its tail, now i do not know if there has been any others in recent years other than the helicarrier...

I just build #31077 Modular Sweet Surprises and they use a 1x2 tile with 2 clips as a technique. Some building methods are just illegal until they aren't. But I'll be surprised the day that Lego starts using minifigure hands as detailing.

Thank you for sharing the Stressing the Elements presentation - very interesting. On p. 24 it has the vertical plate in a horizontal plate marked as illegal. But that's how the "ears" of the horse are connected to the head in the classic 375 castle - http://peeron.com/scans/375-2/18 Maybe it matters that it's a tile, not a plate, in 375? Or maybe they later decided it's illegal.

Edited to add - I continued reading Stressing the Elements, and on p. 28 it explains that that technique was legal back then, illegal now. So, nevermind!

But some are also specific case. Like no AFOL cares if system bricks get stuck in technic holes, just use a brick seperator. Also, about not sticking cones into the bottom of bricks, some cones are slightly different and do have stops.

I guess Lego have to build sets that kids can handle, but AFOLs don't. There are occasionally techniques used in Modulars and the likes that would never make it to a playset. Kind of like how smoking is legal, but not for children.

According to Jang, the nano scale Hogwarts Castle uses an illegal technique to connect the arched walkway.

So, I was just building this part of the castle (video here and @Huw talks about it in his review too). When I was putting in the bridge it didn't seem to be forced at all. It fitted perfectly. But at the end of the bag I had a 1x1 stud left over. Lo and behold, when I put that one in, it did put stress on the rest of the bridge. So it seems to me that if you skip the stud in step 231, there is no issue at all. I wonder if I accidently stumbled on the solution?

Anyone who has got this built up at the moment, would be interesting to see if you agree with me. Here is the picture with the stud missing, so it looks like one of the arches isn't totally finished. But, all the other bricks now line up perfectly and no stress. Plus it's on the inside of the build so you can't really see it.

Seeing as how this thread is back, I thought it'd be worth mentioning that the slideshow posted here earlier has coincidentally become a popular meme over the past couple of weeks. Seems to have started on r/lego and spread to mainstream Reddit before going to Instagram. Not exactly meaningful news to most people here, but I think it's funny how these things turn out.